1. 23 5月, 2018 1 次提交
  2. 23 4月, 2018 1 次提交
  3. 20 4月, 2018 2 次提交
    • M
      bpf: btf: Sync bpf.h and btf.h to tools/ · 3bd86a84
      Martin KaFai Lau 提交于
      This patch sync up the bpf.h and btf.h to tools/
      Signed-off-by: NMartin KaFai Lau <kafai@fb.com>
      Acked-by: NAlexei Starovoitov <ast@fb.com>
      Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>
      3bd86a84
    • M
      bpf: btf: Introduce BPF Type Format (BTF) · 69b693f0
      Martin KaFai Lau 提交于
      This patch introduces BPF type Format (BTF).
      
      BTF (BPF Type Format) is the meta data format which describes
      the data types of BPF program/map.  Hence, it basically focus
      on the C programming language which the modern BPF is primary
      using.  The first use case is to provide a generic pretty print
      capability for a BPF map.
      
      BTF has its root from CTF (Compact C-Type format).  To simplify
      the handling of BTF data, BTF removes the differences between
      small and big type/struct-member.  Hence, BTF consistently uses u32
      instead of supporting both "one u16" and "two u32 (+padding)" in
      describing type and struct-member.
      
      It also raises the number of types (and functions) limit
      from 0x7fff to 0x7fffffff.
      
      Due to the above changes,  the format is not compatible to CTF.
      Hence, BTF starts with a new BTF_MAGIC and version number.
      
      This patch does the first verification pass to the BTF.  The first
      pass checks:
      1. meta-data size (e.g. It does not go beyond the total btf's size)
      2. name_offset is valid
      3. Each BTF_KIND (e.g. int, enum, struct....) does its
         own check of its meta-data.
      
      Some other checks, like checking a struct's member is referring
      to a valid type, can only be done in the second pass.  The second
      verification pass will be implemented in the next patch.
      Signed-off-by: NMartin KaFai Lau <kafai@fb.com>
      Acked-by: NAlexei Starovoitov <ast@fb.com>
      Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>
      69b693f0